Add comment regarding JSC and ICU versions

Author: ukasiu

fetch_sources.sh

@@ -1,20 +1,20 @@
 #!/bin/bash
 
 TARGET_DIR=target
+# This SVN revision number was determined by looking for the latest iOS release at https://trac.webkit.org/browser/webkit/releases/Apple
 SVN_REV=216995
-
 mkdir -p $TARGET_DIR/webkit
 svn export -r $SVN_REV https://svn.webkit.org/repository/webkit/trunk/Source $TARGET_DIR/webkit/Source
 svn export -r $SVN_REV https://svn.webkit.org/repository/webkit/trunk/Tools $TARGET_DIR/webkit/Tools
 svn export -r $SVN_REV https://svn.webkit.org/repository/webkit/trunk/CMakeLists.txt $TARGET_DIR/webkit/CMakeLists.txt
 
-
+# As the trunk for $SVN_REV differs from releases dir I'm replacing JSC and WTF with versions from releases dir
 rm -rf $TARGET_DIR/webkit/Source/JavaScriptCore
 svn export -r $SVN_REV https://svn.webkit.org/repository/webkit/releases/Apple/iOS%2010.3.2/JavaScriptCore $TARGET_DIR/webkit/Source/JavaScriptCore
 
 rm -rf $TARGET_DIR/webkit/Source/WTF
 svn export -r $SVN_REV https://svn.webkit.org/repository/webkit/releases/Apple/iOS%2010.3.2/WTF $TARGET_DIR/webkit/Source/WTF
 
-
 mkdir -p $TARGET_DIR/icu
+# This is for the latest release for the latest android from https://android.googlesource.com/platform/external/icu/
 curl https://android.googlesource.com/platform/external/icu/+archive/android-7.1.2_r11/icu4c.tar.gz | tar xzf - -C $TARGET_DIR/icu